Improvement in boiler-furnace draught-regulators



WILLIAM E. PEARSON. Improvement in Boiler-Furnace Draft-Regulators. No114 965 Patented May16,1871.

5 his adfior'ne I i dnitet State WILLIAM EVERETT PEARSON, OF EASTBOSTON, 'ASSIGNOR TO HIMSELF AND JAMES O. WILSON, OELYN N,MASSACHUSETTS.

Letters Patent No. 114,965, dated May 16, 1871.

1 IMPROVEMENT IN BOILER-FURNACE DRAUGHT-REGULATORS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all persons to whom these presents may come Be it known that I,WILLIAM EvERsT'r'PnARsoN, of East Boston, of the county 'of Suffolk andState oi Massachusetts," have invented a new and useful Apparatus ,orGovernor for Regulating the Pressure of Steam Within a Boiler; and dohereby declare the same to be fully described in the followingspecification and represented in the accompanying drawing, whichexhibits a sectional elevation of such apparatus as applied to asteam-boiler and its furnace and chimney.

In such drawing- A denotes the boiler, and abthe chimney of its furnace,provided with a damper,

From an arm, 0, extended from the stem or shaft of the damper, a chainor line, (1, leads upward, and thence over one or more pulleys orthrough guidese e, and thence down to and is fastened to the longer armof a lever, F, connected by a rod, h, with an arm,

j; ofa sect-oral valve, 9, contained within a case or cylinder, B.

From the top of such cylinder an escape-pipe, 0, leads.

Another such pipe, D, is led out of one side of the case B to and intoand up within the chimney a.

A pipe, E, supposed to lead from the exhaust-port of the steam-engine ofthe said furnace, enters or opens into the case or cylinder B.

A lever, B, is pivoted to a standard, t, erected on the side of ashort'upright cylinder, G, in which is a piston, H, whose rod k ispivoted to the lever F.

The cylinder G communicates with the boiler by means of a pipe, 1,leading from the steam-space of the boiler into the bottom of thecylinder.

There is upon the longer arm of the lever Fan adjustable weight, I.

It, now, we suppose it be desirable to maintain the steam in thbuiler ator about at Et'llIllfUl'lI] pressure,

as, lor instance, one hundred pounds per square inch, the valve 9 is tobe moved so as to cover the mouth of the blast-pipe D. Y

The weight I should next be moved'on the lever F, to counterbalance thepressure of the steam on the piston H of the cylinder, the steambeingsupposed to be at the desired tension. Under these circumstances thedamper of the chimney is to be supposed to be nearly closed, orsufijciently' open. to insure the proper combustion in the furnace.

Now, should theboiler. not make steam fast enough, or the pressurebecome lessened or less than the-rate prescribed, the piston H willfall, so as to cause the valve 9 to uncover the blast-pipe D and closethe. lower end of the pipe 0.

In consequence of this the exhaust-steam of the engine, instead ofescaping into the atmosphere through the pipe 0, will be turned into thepipe I),

and, rushing up through it and into the chimney, will increase thedraught of the furnace. At the same time the damper will be opened ormoved so as to increase the opening for the discharge of the draught orsmoke.

As a result, the combustion of the fuel will be increased, and the steamwill 'be increased and elevated in pressure. 7

When the pressure may have attained the normal rate the piston H will beforced upward and the valve y will be moved so as to exclude theexhaust-steam from the pipe D and cause it to escape through the pipe 0.

In some cases the damper and its connection with the lever F may bedispensed with.

I am aware of the inventions described in the Unit ed Statespatents Nos.10,387, 12,805, 14,605, 28,675, and 52,114, and I make no claim to anything, combination, or arrangement of parts described in'either of thesaid patents.

Neither of them shows two cxhaust-pipes,a valvecase and valve, (like thepipes G D,-the case B, and the valve g, hereinb'efore explained,)arranged. and combined with a boiler and chimney and the damp orthereof, or with such and a lever, piston, and cylinder, applied to -theboiler, as represented in the accompanying drawing.

By means of the two-branch exhaust O D, the valve-case B', and the valveg, the exhaust-steam may be used in the chimney or be allowed to escapeinto the atmosphere.

Thus, with my apparatus, results follow which are not incident to anyapparatus described in either of such patents; therefore, 7

I claim I I 1, The combination of the cylinder G, the piston H, thelever B, the weight I, the case B, the valve g, and the blast-pipes O D,all arranged and combined substantiallyin manner and-for the purposedescribed. -2. The combination of the cylinder G, the piston 'H, thelever 1 the weight I, the caseB, the valve g,

Witnesses:

R. H. EDDY, S. N. P1PnR.

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